Thomas McKay Martin Jr., known professionally as T. J. Martin, is an American filmmaker. Martin's film Undefeated (2011), for which he was co-director, co-editor, and co-cinematographer, won the 2012 Academy Award for Best Documentary Feature, making Martin the first film director of African-American descent to win an Academy Award for a feature-length film.

Undefeated is a 2011 American documentary film directed by Daniel Lindsay and T. J. Martin. The film documents the struggles of a high school football team, the Manassas Tigers of Memphis, as they attempt a winning season after years of losses. The team is turned around by coach Bill Courtney, who helps form a group of young men into an academic and athletic team.